mirror of
https://github.com/django/django.git
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a23c9c48a8
Browsers consider the first newline in textareas as some display
artifact, not real content. Hence they are not sending it back to
the server. If we want to keep initial newlines, we have to add one
when we render the textarea.
Thanks bastih for the report and initial patch.
Backport of 78f66691ee from master.
913 lines
34 KiB
Python
913 lines
34 KiB
Python
"""
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HTML Widget classes
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"""
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from __future__ import absolute_import, unicode_literals
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import copy
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import datetime
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from itertools import chain
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try:
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from urllib.parse import urljoin
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except ImportError: # Python 2
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from urlparse import urljoin
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from django.conf import settings
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from django.forms.util import flatatt, to_current_timezone
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from django.utils.datastructures import MultiValueDict, MergeDict
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from django.utils.html import conditional_escape, format_html, format_html_join
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from django.utils.translation import ugettext, ugettext_lazy
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from django.utils.encoding import force_text, python_2_unicode_compatible
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from django.utils.safestring import mark_safe
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from django.utils import datetime_safe, formats, six
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__all__ = (
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'Media', 'MediaDefiningClass', 'Widget', 'TextInput', 'PasswordInput',
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'HiddenInput', 'MultipleHiddenInput', 'ClearableFileInput',
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'FileInput', 'DateInput', 'DateTimeInput', 'TimeInput', 'Textarea', 'CheckboxInput',
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'Select', 'NullBooleanSelect', 'SelectMultiple', 'RadioSelect',
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'CheckboxSelectMultiple', 'MultiWidget',
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'SplitDateTimeWidget',
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)
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MEDIA_TYPES = ('css','js')
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@python_2_unicode_compatible
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class Media(object):
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def __init__(self, media=None, **kwargs):
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if media:
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media_attrs = media.__dict__
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else:
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media_attrs = kwargs
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self._css = {}
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self._js = []
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for name in MEDIA_TYPES:
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getattr(self, 'add_' + name)(media_attrs.get(name, None))
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# Any leftover attributes must be invalid.
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# if media_attrs != {}:
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# raise TypeError("'class Media' has invalid attribute(s): %s" % ','.join(media_attrs.keys()))
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def __str__(self):
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return self.render()
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def render(self):
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return mark_safe('\n'.join(chain(*[getattr(self, 'render_' + name)() for name in MEDIA_TYPES])))
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def render_js(self):
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return [format_html('<script type="text/javascript" src="{0}"></script>', self.absolute_path(path)) for path in self._js]
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def render_css(self):
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# To keep rendering order consistent, we can't just iterate over items().
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# We need to sort the keys, and iterate over the sorted list.
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media = sorted(self._css.keys())
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return chain(*[
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[format_html('<link href="{0}" type="text/css" media="{1}" rel="stylesheet" />', self.absolute_path(path), medium)
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for path in self._css[medium]]
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for medium in media])
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def absolute_path(self, path, prefix=None):
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if path.startswith(('http://', 'https://', '/')):
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return path
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if prefix is None:
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if settings.STATIC_URL is None:
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# backwards compatibility
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prefix = settings.MEDIA_URL
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else:
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prefix = settings.STATIC_URL
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return urljoin(prefix, path)
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def __getitem__(self, name):
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"Returns a Media object that only contains media of the given type"
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if name in MEDIA_TYPES:
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return Media(**{str(name): getattr(self, '_' + name)})
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raise KeyError('Unknown media type "%s"' % name)
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def add_js(self, data):
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if data:
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for path in data:
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if path not in self._js:
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self._js.append(path)
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def add_css(self, data):
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if data:
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for medium, paths in data.items():
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for path in paths:
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if not self._css.get(medium) or path not in self._css[medium]:
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self._css.setdefault(medium, []).append(path)
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def __add__(self, other):
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combined = Media()
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for name in MEDIA_TYPES:
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getattr(combined, 'add_' + name)(getattr(self, '_' + name, None))
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getattr(combined, 'add_' + name)(getattr(other, '_' + name, None))
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return combined
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def media_property(cls):
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def _media(self):
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# Get the media property of the superclass, if it exists
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sup_cls = super(cls, self)
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try:
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base = sup_cls.media
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except AttributeError:
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base = Media()
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# Get the media definition for this class
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definition = getattr(cls, 'Media', None)
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if definition:
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extend = getattr(definition, 'extend', True)
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if extend:
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if extend == True:
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m = base
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else:
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m = Media()
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for medium in extend:
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m = m + base[medium]
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return m + Media(definition)
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else:
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return Media(definition)
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else:
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return base
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return property(_media)
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class MediaDefiningClass(type):
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"Metaclass for classes that can have media definitions"
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def __new__(cls, name, bases, attrs):
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new_class = super(MediaDefiningClass, cls).__new__(cls, name, bases,
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attrs)
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if 'media' not in attrs:
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new_class.media = media_property(new_class)
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return new_class
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@python_2_unicode_compatible
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class SubWidget(object):
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"""
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Some widgets are made of multiple HTML elements -- namely, RadioSelect.
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This is a class that represents the "inner" HTML element of a widget.
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"""
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def __init__(self, parent_widget, name, value, attrs, choices):
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self.parent_widget = parent_widget
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self.name, self.value = name, value
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self.attrs, self.choices = attrs, choices
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def __str__(self):
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args = [self.name, self.value, self.attrs]
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if self.choices:
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args.append(self.choices)
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return self.parent_widget.render(*args)
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class Widget(six.with_metaclass(MediaDefiningClass)):
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is_hidden = False # Determines whether this corresponds to an <input type="hidden">.
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needs_multipart_form = False # Determines does this widget need multipart form
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is_localized = False
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is_required = False
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def __init__(self, attrs=None):
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if attrs is not None:
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self.attrs = attrs.copy()
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else:
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self.attrs = {}
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def __deepcopy__(self, memo):
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obj = copy.copy(self)
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obj.attrs = self.attrs.copy()
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memo[id(self)] = obj
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return obj
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def subwidgets(self, name, value, attrs=None, choices=()):
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"""
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Yields all "subwidgets" of this widget. Used only by RadioSelect to
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allow template access to individual <input type="radio"> buttons.
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Arguments are the same as for render().
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"""
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yield SubWidget(self, name, value, attrs, choices)
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def render(self, name, value, attrs=None):
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"""
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Returns this Widget rendered as HTML, as a Unicode string.
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The 'value' given is not guaranteed to be valid input, so subclass
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implementations should program defensively.
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"""
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raise NotImplementedError
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def build_attrs(self, extra_attrs=None, **kwargs):
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"Helper function for building an attribute dictionary."
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attrs = dict(self.attrs, **kwargs)
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if extra_attrs:
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attrs.update(extra_attrs)
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return attrs
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def value_from_datadict(self, data, files, name):
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"""
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Given a dictionary of data and this widget's name, returns the value
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of this widget. Returns None if it's not provided.
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"""
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return data.get(name, None)
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def _has_changed(self, initial, data):
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"""
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Return True if data differs from initial.
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"""
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# For purposes of seeing whether something has changed, None is
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# the same as an empty string, if the data or inital value we get
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# is None, replace it w/ ''.
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if data is None:
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data_value = ''
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else:
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data_value = data
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if initial is None:
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initial_value = ''
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else:
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initial_value = initial
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if force_text(initial_value) != force_text(data_value):
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return True
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return False
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def id_for_label(self, id_):
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"""
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Returns the HTML ID attribute of this Widget for use by a <label>,
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given the ID of the field. Returns None if no ID is available.
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This hook is necessary because some widgets have multiple HTML
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elements and, thus, multiple IDs. In that case, this method should
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return an ID value that corresponds to the first ID in the widget's
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tags.
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"""
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return id_
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class Input(Widget):
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"""
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Base class for all <input> widgets (except type='checkbox' and
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type='radio', which are special).
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"""
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input_type = None # Subclasses must define this.
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def _format_value(self, value):
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if self.is_localized:
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return formats.localize_input(value)
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return value
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def render(self, name, value, attrs=None):
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if value is None:
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value = ''
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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if value != '':
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# Only add the 'value' attribute if a value is non-empty.
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final_attrs['value'] = force_text(self._format_value(value))
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return format_html('<input{0} />', flatatt(final_attrs))
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class TextInput(Input):
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input_type = 'text'
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def __init__(self, attrs=None):
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if attrs is not None:
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self.input_type = attrs.pop('type', self.input_type)
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super(TextInput, self).__init__(attrs)
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class PasswordInput(TextInput):
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input_type = 'password'
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def __init__(self, attrs=None, render_value=False):
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super(PasswordInput, self).__init__(attrs)
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self.render_value = render_value
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def render(self, name, value, attrs=None):
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if not self.render_value: value=None
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return super(PasswordInput, self).render(name, value, attrs)
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class HiddenInput(Input):
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input_type = 'hidden'
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is_hidden = True
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class MultipleHiddenInput(HiddenInput):
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"""
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A widget that handles <input type="hidden"> for fields that have a list
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of values.
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"""
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def __init__(self, attrs=None, choices=()):
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super(MultipleHiddenInput, self).__init__(attrs)
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# choices can be any iterable
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self.choices = choices
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def render(self, name, value, attrs=None, choices=()):
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if value is None: value = []
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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id_ = final_attrs.get('id', None)
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inputs = []
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for i, v in enumerate(value):
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input_attrs = dict(value=force_text(v), **final_attrs)
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if id_:
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# An ID attribute was given. Add a numeric index as a suffix
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# so that the inputs don't all have the same ID attribute.
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input_attrs['id'] = '%s_%s' % (id_, i)
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inputs.append(format_html('<input{0} />', flatatt(input_attrs)))
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return mark_safe('\n'.join(inputs))
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def value_from_datadict(self, data, files, name):
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if isinstance(data, (MultiValueDict, MergeDict)):
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return data.getlist(name)
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return data.get(name, None)
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class FileInput(Input):
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input_type = 'file'
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needs_multipart_form = True
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def render(self, name, value, attrs=None):
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return super(FileInput, self).render(name, None, attrs=attrs)
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def value_from_datadict(self, data, files, name):
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"File widgets take data from FILES, not POST"
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return files.get(name, None)
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def _has_changed(self, initial, data):
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if data is None:
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return False
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return True
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FILE_INPUT_CONTRADICTION = object()
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class ClearableFileInput(FileInput):
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initial_text = ugettext_lazy('Currently')
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input_text = ugettext_lazy('Change')
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clear_checkbox_label = ugettext_lazy('Clear')
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template_with_initial = '%(initial_text)s: %(initial)s %(clear_template)s<br />%(input_text)s: %(input)s'
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template_with_clear = '%(clear)s <label for="%(clear_checkbox_id)s">%(clear_checkbox_label)s</label>'
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def clear_checkbox_name(self, name):
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"""
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Given the name of the file input, return the name of the clear checkbox
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input.
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"""
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return name + '-clear'
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def clear_checkbox_id(self, name):
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"""
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Given the name of the clear checkbox input, return the HTML id for it.
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"""
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return name + '_id'
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def render(self, name, value, attrs=None):
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substitutions = {
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'initial_text': self.initial_text,
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'input_text': self.input_text,
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'clear_template': '',
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'clear_checkbox_label': self.clear_checkbox_label,
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}
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template = '%(input)s'
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substitutions['input'] = super(ClearableFileInput, self).render(name, value, attrs)
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if value and hasattr(value, "url"):
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template = self.template_with_initial
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substitutions['initial'] = format_html('<a href="{0}">{1}</a>',
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value.url,
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force_text(value))
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if not self.is_required:
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checkbox_name = self.clear_checkbox_name(name)
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checkbox_id = self.clear_checkbox_id(checkbox_name)
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substitutions['clear_checkbox_name'] = conditional_escape(checkbox_name)
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substitutions['clear_checkbox_id'] = conditional_escape(checkbox_id)
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substitutions['clear'] = CheckboxInput().render(checkbox_name, False, attrs={'id': checkbox_id})
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substitutions['clear_template'] = self.template_with_clear % substitutions
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return mark_safe(template % substitutions)
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def value_from_datadict(self, data, files, name):
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upload = super(ClearableFileInput, self).value_from_datadict(data, files, name)
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if not self.is_required and CheckboxInput().value_from_datadict(
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data, files, self.clear_checkbox_name(name)):
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if upload:
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# If the user contradicts themselves (uploads a new file AND
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# checks the "clear" checkbox), we return a unique marker
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# object that FileField will turn into a ValidationError.
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return FILE_INPUT_CONTRADICTION
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# False signals to clear any existing value, as opposed to just None
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return False
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return upload
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class Textarea(Widget):
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def __init__(self, attrs=None):
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# The 'rows' and 'cols' attributes are required for HTML correctness.
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default_attrs = {'cols': '40', 'rows': '10'}
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if attrs:
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default_attrs.update(attrs)
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super(Textarea, self).__init__(default_attrs)
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def render(self, name, value, attrs=None):
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if value is None: value = ''
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final_attrs = self.build_attrs(attrs, name=name)
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return format_html('<textarea{0}>\r\n{1}</textarea>',
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flatatt(final_attrs),
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force_text(value))
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|
|
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class DateInput(TextInput):
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def __init__(self, attrs=None, format=None):
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super(DateInput, self).__init__(attrs)
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if format:
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self.format = format
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self.manual_format = True
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else:
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self.format = formats.get_format('DATE_INPUT_FORMATS')[0]
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self.manual_format = False
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def _format_value(self, value):
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if self.is_localized and not self.manual_format:
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return formats.localize_input(value)
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elif hasattr(value, 'strftime'):
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value = datetime_safe.new_date(value)
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return value.strftime(self.format)
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return value
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def _has_changed(self, initial, data):
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# If our field has show_hidden_initial=True, initial will be a string
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# formatted by HiddenInput using formats.localize_input, which is not
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# necessarily the format used for this widget. Attempt to convert it.
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|
try:
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|
input_format = formats.get_format('DATE_INPUT_FORMATS')[0]
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initial = datetime.datetime.strptime(initial, input_format).date()
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except (TypeError, ValueError):
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pass
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return super(DateInput, self)._has_changed(self._format_value(initial), data)
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|
|
|
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class DateTimeInput(TextInput):
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def __init__(self, attrs=None, format=None):
|
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super(DateTimeInput, self).__init__(attrs)
|
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if format:
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self.format = format
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self.manual_format = True
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|
else:
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self.format = formats.get_format('DATETIME_INPUT_FORMATS')[0]
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self.manual_format = False
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|
|
|
def _format_value(self, value):
|
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if self.is_localized and not self.manual_format:
|
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return formats.localize_input(value)
|
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elif hasattr(value, 'strftime'):
|
|
value = datetime_safe.new_datetime(value)
|
|
return value.strftime(self.format)
|
|
return value
|
|
|
|
def _has_changed(self, initial, data):
|
|
# If our field has show_hidden_initial=True, initial will be a string
|
|
# formatted by HiddenInput using formats.localize_input, which is not
|
|
# necessarily the format used for this widget. Attempt to convert it.
|
|
try:
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|
input_format = formats.get_format('DATETIME_INPUT_FORMATS')[0]
|
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initial = datetime.datetime.strptime(initial, input_format)
|
|
except (TypeError, ValueError):
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pass
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return super(DateTimeInput, self)._has_changed(self._format_value(initial), data)
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|
|
|
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class TimeInput(TextInput):
|
|
def __init__(self, attrs=None, format=None):
|
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super(TimeInput, self).__init__(attrs)
|
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if format:
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|
self.format = format
|
|
self.manual_format = True
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|
else:
|
|
self.format = formats.get_format('TIME_INPUT_FORMATS')[0]
|
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self.manual_format = False
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|
|
|
def _format_value(self, value):
|
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if self.is_localized and not self.manual_format:
|
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return formats.localize_input(value)
|
|
elif hasattr(value, 'strftime'):
|
|
return value.strftime(self.format)
|
|
return value
|
|
|
|
def _has_changed(self, initial, data):
|
|
# If our field has show_hidden_initial=True, initial will be a string
|
|
# formatted by HiddenInput using formats.localize_input, which is not
|
|
# necessarily the format used for this widget. Attempt to convert it.
|
|
try:
|
|
input_format = formats.get_format('TIME_INPUT_FORMATS')[0]
|
|
initial = datetime.datetime.strptime(initial, input_format).time()
|
|
except (TypeError, ValueError):
|
|
pass
|
|
return super(TimeInput, self)._has_changed(self._format_value(initial), data)
|
|
|
|
|
|
# Defined at module level so that CheckboxInput is picklable (#17976)
|
|
def boolean_check(v):
|
|
return not (v is False or v is None or v == '')
|
|
|
|
|
|
class CheckboxInput(Widget):
|
|
def __init__(self, attrs=None, check_test=None):
|
|
super(CheckboxInput, self).__init__(attrs)
|
|
# check_test is a callable that takes a value and returns True
|
|
# if the checkbox should be checked for that value.
|
|
self.check_test = boolean_check if check_test is None else check_test
|
|
|
|
def render(self, name, value, attrs=None):
|
|
final_attrs = self.build_attrs(attrs, type='checkbox', name=name)
|
|
if self.check_test(value):
|
|
final_attrs['checked'] = 'checked'
|
|
if not (value is True or value is False or value is None or value == ''):
|
|
# Only add the 'value' attribute if a value is non-empty.
|
|
final_attrs['value'] = force_text(value)
|
|
return format_html('<input{0} />', flatatt(final_attrs))
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
if name not in data:
|
|
# A missing value means False because HTML form submission does not
|
|
# send results for unselected checkboxes.
|
|
return False
|
|
value = data.get(name)
|
|
# Translate true and false strings to boolean values.
|
|
values = {'true': True, 'false': False}
|
|
if isinstance(value, six.string_types):
|
|
value = values.get(value.lower(), value)
|
|
return bool(value)
|
|
|
|
def _has_changed(self, initial, data):
|
|
# Sometimes data or initial could be None or '' which should be the
|
|
# same thing as False.
|
|
return bool(initial) != bool(data)
|
|
|
|
class Select(Widget):
|
|
allow_multiple_selected = False
|
|
|
|
def __init__(self, attrs=None, choices=()):
|
|
super(Select, self).__init__(attrs)
|
|
# choices can be any iterable, but we may need to render this widget
|
|
# multiple times. Thus, collapse it into a list so it can be consumed
|
|
# more than once.
|
|
self.choices = list(choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = ''
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = [format_html('<select{0}>', flatatt(final_attrs))]
|
|
options = self.render_options(choices, [value])
|
|
if options:
|
|
output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def render_option(self, selected_choices, option_value, option_label):
|
|
option_value = force_text(option_value)
|
|
if option_value in selected_choices:
|
|
selected_html = mark_safe(' selected="selected"')
|
|
if not self.allow_multiple_selected:
|
|
# Only allow for a single selection.
|
|
selected_choices.remove(option_value)
|
|
else:
|
|
selected_html = ''
|
|
return format_html('<option value="{0}"{1}>{2}</option>',
|
|
option_value,
|
|
selected_html,
|
|
force_text(option_label))
|
|
|
|
def render_options(self, choices, selected_choices):
|
|
# Normalize to strings.
|
|
selected_choices = set(force_text(v) for v in selected_choices)
|
|
output = []
|
|
for option_value, option_label in chain(self.choices, choices):
|
|
if isinstance(option_label, (list, tuple)):
|
|
output.append(format_html('<optgroup label="{0}">', force_text(option_value)))
|
|
for option in option_label:
|
|
output.append(self.render_option(selected_choices, *option))
|
|
output.append('</optgroup>')
|
|
else:
|
|
output.append(self.render_option(selected_choices, option_value, option_label))
|
|
return '\n'.join(output)
|
|
|
|
class NullBooleanSelect(Select):
|
|
"""
|
|
A Select Widget intended to be used with NullBooleanField.
|
|
"""
|
|
def __init__(self, attrs=None):
|
|
choices = (('1', ugettext_lazy('Unknown')),
|
|
('2', ugettext_lazy('Yes')),
|
|
('3', ugettext_lazy('No')))
|
|
super(NullBooleanSelect, self).__init__(attrs, choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
try:
|
|
value = {True: '2', False: '3', '2': '2', '3': '3'}[value]
|
|
except KeyError:
|
|
value = '1'
|
|
return super(NullBooleanSelect, self).render(name, value, attrs, choices)
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
value = data.get(name, None)
|
|
return {'2': True,
|
|
True: True,
|
|
'True': True,
|
|
'3': False,
|
|
'False': False,
|
|
False: False}.get(value, None)
|
|
|
|
def _has_changed(self, initial, data):
|
|
# For a NullBooleanSelect, None (unknown) and False (No)
|
|
# are not the same
|
|
if initial is not None:
|
|
initial = bool(initial)
|
|
if data is not None:
|
|
data = bool(data)
|
|
return initial != data
|
|
|
|
class SelectMultiple(Select):
|
|
allow_multiple_selected = True
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = []
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = [format_html('<select multiple="multiple"{0}>', flatatt(final_attrs))]
|
|
options = self.render_options(choices, value)
|
|
if options:
|
|
output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
if isinstance(data, (MultiValueDict, MergeDict)):
|
|
return data.getlist(name)
|
|
return data.get(name, None)
|
|
|
|
def _has_changed(self, initial, data):
|
|
if initial is None:
|
|
initial = []
|
|
if data is None:
|
|
data = []
|
|
if len(initial) != len(data):
|
|
return True
|
|
initial_set = set([force_text(value) for value in initial])
|
|
data_set = set([force_text(value) for value in data])
|
|
return data_set != initial_set
|
|
|
|
@python_2_unicode_compatible
|
|
class RadioInput(SubWidget):
|
|
"""
|
|
An object used by RadioFieldRenderer that represents a single
|
|
<input type='radio'>.
|
|
"""
|
|
|
|
def __init__(self, name, value, attrs, choice, index):
|
|
self.name, self.value = name, value
|
|
self.attrs = attrs
|
|
self.choice_value = force_text(choice[0])
|
|
self.choice_label = force_text(choice[1])
|
|
self.index = index
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self, name=None, value=None, attrs=None, choices=()):
|
|
name = name or self.name
|
|
value = value or self.value
|
|
attrs = attrs or self.attrs
|
|
if 'id' in self.attrs:
|
|
label_for = format_html(' for="{0}_{1}"', self.attrs['id'], self.index)
|
|
else:
|
|
label_for = ''
|
|
choice_label = force_text(self.choice_label)
|
|
return format_html('<label{0}>{1} {2}</label>', label_for, self.tag(), choice_label)
|
|
|
|
def is_checked(self):
|
|
return self.value == self.choice_value
|
|
|
|
def tag(self):
|
|
if 'id' in self.attrs:
|
|
self.attrs['id'] = '%s_%s' % (self.attrs['id'], self.index)
|
|
final_attrs = dict(self.attrs, type='radio', name=self.name, value=self.choice_value)
|
|
if self.is_checked():
|
|
final_attrs['checked'] = 'checked'
|
|
return format_html('<input{0} />', flatatt(final_attrs))
|
|
|
|
@python_2_unicode_compatible
|
|
class RadioFieldRenderer(object):
|
|
"""
|
|
An object used by RadioSelect to enable customization of radio widgets.
|
|
"""
|
|
|
|
def __init__(self, name, value, attrs, choices):
|
|
self.name, self.value, self.attrs = name, value, attrs
|
|
self.choices = choices
|
|
|
|
def __iter__(self):
|
|
for i, choice in enumerate(self.choices):
|
|
yield RadioInput(self.name, self.value, self.attrs.copy(), choice, i)
|
|
|
|
def __getitem__(self, idx):
|
|
choice = self.choices[idx] # Let the IndexError propogate
|
|
return RadioInput(self.name, self.value, self.attrs.copy(), choice, idx)
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self):
|
|
"""Outputs a <ul> for this set of radio fields."""
|
|
return format_html('<ul>\n{0}\n</ul>',
|
|
format_html_join('\n', '<li>{0}</li>',
|
|
[(force_text(w),) for w in self]
|
|
))
|
|
|
|
class RadioSelect(Select):
|
|
renderer = RadioFieldRenderer
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# Override the default renderer if we were passed one.
|
|
renderer = kwargs.pop('renderer', None)
|
|
if renderer:
|
|
self.renderer = renderer
|
|
super(RadioSelect, self).__init__(*args, **kwargs)
|
|
|
|
def subwidgets(self, name, value, attrs=None, choices=()):
|
|
for widget in self.get_renderer(name, value, attrs, choices):
|
|
yield widget
|
|
|
|
def get_renderer(self, name, value, attrs=None, choices=()):
|
|
"""Returns an instance of the renderer."""
|
|
if value is None: value = ''
|
|
str_value = force_text(value) # Normalize to string.
|
|
final_attrs = self.build_attrs(attrs)
|
|
choices = list(chain(self.choices, choices))
|
|
return self.renderer(name, str_value, final_attrs, choices)
|
|
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
return self.get_renderer(name, value, attrs, choices).render()
|
|
|
|
def id_for_label(self, id_):
|
|
# RadioSelect is represented by multiple <input type="radio"> fields,
|
|
# each of which has a distinct ID. The IDs are made distinct by a "_X"
|
|
# suffix, where X is the zero-based index of the radio field. Thus,
|
|
# the label for a RadioSelect should reference the first one ('_0').
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
class CheckboxSelectMultiple(SelectMultiple):
|
|
def render(self, name, value, attrs=None, choices=()):
|
|
if value is None: value = []
|
|
has_id = attrs and 'id' in attrs
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = ['<ul>']
|
|
# Normalize to strings
|
|
str_values = set([force_text(v) for v in value])
|
|
for i, (option_value, option_label) in enumerate(chain(self.choices, choices)):
|
|
# If an ID attribute was given, add a numeric index as a suffix,
|
|
# so that the checkboxes don't all have the same ID attribute.
|
|
if has_id:
|
|
final_attrs = dict(final_attrs, id='%s_%s' % (attrs['id'], i))
|
|
label_for = format_html(' for="{0}"', final_attrs['id'])
|
|
else:
|
|
label_for = ''
|
|
|
|
cb = CheckboxInput(final_attrs, check_test=lambda value: value in str_values)
|
|
option_value = force_text(option_value)
|
|
rendered_cb = cb.render(name, option_value)
|
|
option_label = force_text(option_label)
|
|
output.append(format_html('<li><label{0}>{1} {2}</label></li>',
|
|
label_for, rendered_cb, option_label))
|
|
output.append('</ul>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
class MultiWidget(Widget):
|
|
"""
|
|
A widget that is composed of multiple widgets.
|
|
|
|
Its render() method is different than other widgets', because it has to
|
|
figure out how to split a single value for display in multiple widgets.
|
|
The ``value`` argument can be one of two things:
|
|
|
|
* A list.
|
|
* A normal value (e.g., a string) that has been "compressed" from
|
|
a list of values.
|
|
|
|
In the second case -- i.e., if the value is NOT a list -- render() will
|
|
first "decompress" the value into a list before rendering it. It does so by
|
|
calling the decompress() method, which MultiWidget subclasses must
|
|
implement. This method takes a single "compressed" value and returns a
|
|
list.
|
|
|
|
When render() does its HTML rendering, each value in the list is rendered
|
|
with the corresponding widget -- the first value is rendered in the first
|
|
widget, the second value is rendered in the second widget, etc.
|
|
|
|
Subclasses may implement format_output(), which takes the list of rendered
|
|
widgets and returns a string of HTML that formats them any way you'd like.
|
|
|
|
You'll probably want to use this class with MultiValueField.
|
|
"""
|
|
def __init__(self, widgets, attrs=None):
|
|
self.widgets = [isinstance(w, type) and w() or w for w in widgets]
|
|
super(MultiWidget, self).__init__(attrs)
|
|
|
|
def render(self, name, value, attrs=None):
|
|
if self.is_localized:
|
|
for widget in self.widgets:
|
|
widget.is_localized = self.is_localized
|
|
# value is a list of values, each corresponding to a widget
|
|
# in self.widgets.
|
|
if not isinstance(value, list):
|
|
value = self.decompress(value)
|
|
output = []
|
|
final_attrs = self.build_attrs(attrs)
|
|
id_ = final_attrs.get('id', None)
|
|
for i, widget in enumerate(self.widgets):
|
|
try:
|
|
widget_value = value[i]
|
|
except IndexError:
|
|
widget_value = None
|
|
if id_:
|
|
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i))
|
|
output.append(widget.render(name + '_%s' % i, widget_value, final_attrs))
|
|
return mark_safe(self.format_output(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
return [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)]
|
|
|
|
def _has_changed(self, initial, data):
|
|
if initial is None:
|
|
initial = ['' for x in range(0, len(data))]
|
|
else:
|
|
if not isinstance(initial, list):
|
|
initial = self.decompress(initial)
|
|
for widget, initial, data in zip(self.widgets, initial, data):
|
|
if widget._has_changed(initial, data):
|
|
return True
|
|
return False
|
|
|
|
def format_output(self, rendered_widgets):
|
|
"""
|
|
Given a list of rendered widgets (as strings), returns a Unicode string
|
|
representing the HTML for the whole lot.
|
|
|
|
This hook allows you to format the HTML design of the widgets, if
|
|
needed.
|
|
"""
|
|
return ''.join(rendered_widgets)
|
|
|
|
def decompress(self, value):
|
|
"""
|
|
Returns a list of decompressed values for the given compressed value.
|
|
The given value can be assumed to be valid, but not necessarily
|
|
non-empty.
|
|
"""
|
|
raise NotImplementedError('Subclasses must implement this method.')
|
|
|
|
def _get_media(self):
|
|
"Media for a multiwidget is the combination of all media of the subwidgets"
|
|
media = Media()
|
|
for w in self.widgets:
|
|
media = media + w.media
|
|
return media
|
|
media = property(_get_media)
|
|
|
|
def __deepcopy__(self, memo):
|
|
obj = super(MultiWidget, self).__deepcopy__(memo)
|
|
obj.widgets = copy.deepcopy(self.widgets)
|
|
return obj
|
|
|
|
class SplitDateTimeWidget(MultiWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="text"> boxes.
|
|
"""
|
|
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
widgets = (DateInput(attrs=attrs, format=date_format),
|
|
TimeInput(attrs=attrs, format=time_format))
|
|
super(SplitDateTimeWidget, self).__init__(widgets, attrs)
|
|
|
|
def decompress(self, value):
|
|
if value:
|
|
value = to_current_timezone(value)
|
|
return [value.date(), value.time().replace(microsecond=0)]
|
|
return [None, None]
|
|
|
|
class SplitHiddenDateTimeWidget(SplitDateTimeWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="hidden"> inputs.
|
|
"""
|
|
is_hidden = True
|
|
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
super(SplitHiddenDateTimeWidget, self).__init__(attrs, date_format, time_format)
|
|
for widget in self.widgets:
|
|
widget.input_type = 'hidden'
|
|
widget.is_hidden = True
|